Re-image the appliance from “Configuration -> System Maintenance -> Update Software” by uploading cb-vw_CB410_9.3.3.21.tar.gz file.
Refer to this page.
Once the appliance is rei-maged to version 9.3.3.21 successfully, upload downloaded LCM configuration package of this branch (.zip package)
Complete the process of LCM (Local Change Management). Refer to this page for more details.
After completing LCM (Local Change Management) enable VW service from Configuration > Virtual WAN > Enable/Disable/Purge Flows.
Path should come up between MCN and the site once VW service is enabled.